i concur as i hunt open country in NM. however just the other day i was having a conversation with a guy that does use a doe bleet/fawn type call and he was telling me that he has had a few mulies come in on a rope using this call during the rut so it has peaked my interest.a lot of people hunt mule deer without the use of calls.
largely because i don't think they are very vocal.
i personally don't use them. there's a shortage of places that calling might work. too open here in wyoming.